 Snap, crackle and pop!, engine problems |
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| Petepat |
 Jan 15 2023, 06:55 AM
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#21
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Member  Group: Members Posts: 60 Joined: 1-December 19 From: Florida Member No.: 23,691 Region Association: None  |
QUOTE(ChrisFoley @ Jan 14 2023, 02:51 PM)  The Delorto Superformance Tech Book, by Bob Tomlinson Trying to find this book is more difficult than trying to tune these carbs! I have however found I think enough on the internet to proceed the only question is do I turn the mixture screw back half a turn or three and a half when tuning? it seems different on different sites. I'm actually coming to Florida next month for 3 months Sarasota, any car meetings scheduled? |
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| Superhawk996 |
Jan 15 2023, 07:21 AM
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#22
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914 Guru Group: Members Posts: 5,884 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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Get the Weber book.
Webers and Dellorto are nearly the same with respect to overall layout and tuning principles. The Dellorto book is out of print and much harder to find usually only changes hands in the FS/WTB forum based on postings.  |
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| Petepat |
Jan 16 2023, 04:54 AM
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#23
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Member Group: Members Posts: 60 Joined: 1-December 19 From: Florida Member No.: 23,691 Region Association: None |
QUOTE(Superhawk996 @ Jan 15 2023, 08:21 AM) Get the Weber book. Webers and Dellorto are nearly the same with respect to overall layout and tuning principles. The Dellorto book is out of print and much harder to find usually only changes hands in the FS/WTB forum based on postings. Thanks for that, I have ordered the book and any thoughts on unscrewing the mixture screw half a turn out or three and a half turns? |
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| ChrisFoley |
Jan 16 2023, 05:06 AM
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#24
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I am Tangerine Racing Group: Members Posts: 7,934 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(Petepat @ Jan 16 2023, 05:54 AM) Thanks for that, I have ordered the book and any thoughts on unscrewing the mixture screw half a turn out or three and a half turns? Those mixture screws are for idle tuning only. Idle jet size is for tuning light cruise part throttle mixture. 3 1/2 seems like way too much to me. What really matters is if the mixture is rich enough at idle to prevent misfires. Idle jet size will affect how far open the mixture screws need to be. If you need 3 1/2 turns, the idle jets are likely too small. |
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| Petepat |
Jan 17 2023, 04:25 AM
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#25
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Member Group: Members Posts: 60 Joined: 1-December 19 From: Florida Member No.: 23,691 Region Association: None |
QUOTE(ChrisFoley @ Jan 16 2023, 06:06 AM) QUOTE(Petepat @ Jan 16 2023, 05:54 AM) Thanks for that, I have ordered the book and any thoughts on unscrewing the mixture screw half a turn out or three and a half turns? Those mixture screws are for idle tuning only. Idle jet size is for tuning light cruise part throttle mixture. 3 1/2 seems like way too much to me. What really matters is if the mixture is rich enough at idle to prevent misfires. Idle jet size will affect how far open the mixture screws need to be. If you need 3 1/2 turns, the idle jets are likely too small. That makes a lot of sense to me, thanks. |
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| Petepat |
Jan 19 2023, 04:36 AM
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#26
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Member Group: Members Posts: 60 Joined: 1-December 19 From: Florida Member No.: 23,691 Region Association: None |
So, the Webber book is on it's way but in the meantime I thought I'ld show you all some photos of the fuel system, not that I think this is causing a problem but maybe in need of an upgrade!!
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| Petepat |
Jan 19 2023, 04:42 AM
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#27
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Member Group: Members Posts: 60 Joined: 1-December 19 From: Florida Member No.: 23,691 Region Association: None |
I'm thinking to replace the lot, put the pump at the front and use metal tubing all the way into the engine compartment, fewer joints that way. Any words of wisdom gratefully received.
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| ChrisFoley |
Jan 19 2023, 04:51 AM
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#28
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I am Tangerine Racing Group: Members Posts: 7,934 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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I offer a complete pump and lines kit for carbed cars.
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